今天是在课上写了java四则运算的下一次升级：
package suanshu; import java.util.*; public class Suanshu { private static int [][]shu1=new int[100][100];//cun ru suo you de a de shu ju private static int [][]shu3=new int[100][100];//cun ru suo you de b de shu ju private static long []zhengquedaan=new long[100];//cun chu suo you zheng que da an private static int shu;//xuan ze jin xing ji ge shu de jia jian cheng chu private static int tiLiang;// xuan ze ti mu shu liang private static int chengChu;//pan duan shu fou you cheng chu fa private static int quZhiFanWei1;//qu zhi de qi shi zhi private static int quZhiFanWei2;//qu zhi de zhong zhi zhi private static long sum;//yong yu cun ru suan shi jie guo ,mei ci suan wuan zhi hou dou hui shua xin private static int[] cuoticishu=new int[100];//ji lu cuo ti shu private static long []cuotidaan=new long[100];//bao cuo tuo ti da an public static void yunsuanfu1(int c) { if(c==1) { System.out.print("+"); } if(c==2) { System.out.print("-"); } if(c==3) { System.out.print("*"); } if(c==4) { System.out.print("/"); } } public static void yunsuanfu2(int c) { if(c==1||c==2) { System.out.print("+"); } if(c==3||c==4) { System.out.print("-"); } } public static void Schutisanshu() { Scanner s = new Scanner(System.in); System.out.print("请选择题目数量："); tiLiang=s.nextInt(); System.out.print("请选择是否有乘除法，是则输入1，否输入0"); chengChu=s.nextInt(); System.out.print("请选择取值范围："); quZhiFanWei1=s.nextInt(); System.out.print("-"); quZhiFanWei2=s.nextInt(); System.out.print("请选择操作数个数："); shu=s.nextInt(); } public static char zhuanhuan1(int a) { if(a==1) { return '+'; } if(a==2) {return '-';} if(a==3) {return '*';} if(a==4) {return'/';} return 0; } public static char zhuanhuan2(int a) { if(a==1||a==2) { return '+'; } if(a==3||a==4) {return '-';} return 0; } public static int Pchongfu(int i,int shu,int[] sh,int[] ch,int asd) {//pan duan ti mu shi fou chong fu int j,k; boolean panduan=true; if(i>=1) { for(j=0;j<i;j++) { for(k=0;k<shu;k++) { if(shu1[j][k]==sh[k]) { if(k<shu-1) {if(shu3[j][k]==ch[k]) { asd++;}} } if(asd==shu) {panduan=false;}} }} if(panduan==false) {//dang suan shi chong fu shi,jin xing xia ci xun huan,i-1 return i-1; } return i; } public static void Ssuijishu(int[]sh,int[]ch) { int i,j,k; for(i=0;i<tiLiang;i++) { Random rand1 = new Random(); Random x =new Random();//jue ding yun suan fu hao for(k=0;k<shu;k++) { sh[k]=rand1.nextInt(quZhiFanWei2-quZhiFanWei1+1) + quZhiFanWei1; shu1[i][k]=sh[k]; if(k<shu-1) { ch[k]=x.nextInt(4)+1; shu3[i][k]=ch[k];} } }} public static void suandaan1(int a,int b) { if(b==1) { sum=sum+a; } if(b==2) { sum=sum-a; } if(b==3) { sum=sum*a; } if(sum==4) { sum=sum/a; } } public static void suandaan2(int a,int b) { if(b==1||b==2) { sum=sum+a; } if(b==3||b==4) { sum=sum-a; } } public static void Zuoti(boolean panduan,int bb,int i) { int k,aa; Random randx=new Random(); if(panduan==true&&chengChu==1) { for(k=0;k<shu;k++) { System.out.print(shu1[i][k]); aa=randx.nextInt(100)+1; if(k==0) { sum=shu1[i][k]; } if(aa>30&&aa<60) { if(bb==2) { System.out.print(")"); bb++; } } if(bb==2&&k==shu-1) { System.out.print(")"); } if(k<shu-1) { yunsuanfu1(shu3[i][k]); if(aa>30&&aa<60) { if(bb==1) { System.out.print("("); bb++; } } }if(k<shu-1) { suandaan1(shu1[i][k+1],shu3[i][k]);} } System.out.print("= "); zhengquedaan[i]=sum; sum=0; } if(panduan==true&&chengChu==0) { for(k=0;k<shu;k++) { aa=randx.nextInt(70)+1; if(k==0) { sum=shu1[i][k]; } System.out.print(shu1[i][k]); if(aa>30&&aa<60) { if(bb==2) { System.out.print(")"); bb++; } } if(bb==2&&k==shu-1) { System.out.print(")"); } if(k<shu-1) { yunsuanfu2(shu3[i][k]); if(aa>30&&aa<60) { if(bb==1) { System.out.print("("); bb++; } } }if(k<shu-1) {suandaan2(shu1[i][k+1],shu3[i][k]);} } zhengquedaan[i]=sum; System.out.print("= "); sum=0; } } public static void cuotiji(boolean panduan,boolean[] duicuo) { int k,i; for(i=0;i<tiLiang;i++) { if(duicuo[i]==false) { if(panduan==true&&chengChu==1) { for(k=0;k<shu;k++) { System.out.print(shu1[i][k]); if(k<shu-1) { yunsuanfu1(shu3[i][k]); } } System.out.print("= "); } if(panduan==true&&chengChu==0) { for(k=0;k<shu;k++) { System.out.print(shu1[i][k]); if(k<shu-1) { yunsuanfu2(shu3[i][k]); } } } System.out.print("= ");} } } public static void cuotichonglian(boolean panduan,boolean[] duicuo,int cuowushu) { int i; int daan; Scanner in = new Scanner(System.in); cuotiji(panduan,duicuo); System.out.println("请依次输入答案："); for(i=0;i<cuowushu;i++) { System.out.print("1."); daan=in.nextInt(); if(daan!=cuotidaan[i]) { System.out.println("错误，正确答案为："+cuotidaan[i]); cuoticishu[i]++; } } } public static void main(String[] args) { int i,j=0; int choose1; double zhengqueshu=0,cuowushu=0; double zhengquelv; double yonghudaan; int bb;//aa yong yu panduan shi fou jia kuo hao Scanner s = new Scanner(System.in); int[] sh=new int[100];//yong yu jie shou sui ji shu int[] ch=new int[100]; boolean[] duicuo=new boolean[100]; Schutisanshu(); int asd=0;//yi ge yong yu pan duan panduan shi fou wei true huo false de bianlinag boolean panduan=true;//pan duan shi fou chong fu Ssuijishu(sh,ch); for(i=0;i<100;i++) { cuoticishu[i]=1; } for(i=0;i<tiLiang;i++) { System.out.print((i+1)+"."); bb=1; if(i==Pchongfu(i,shu,sh,ch,asd)) {panduan=true;} if(i!=Pchongfu(i,shu,sh,ch,asd)) {panduan=false;} i=Pchongfu(i,shu,sh,ch,asd); Zuoti(panduan, bb, i); yonghudaan=s.nextDouble(); if(yonghudaan==zhengquedaan[i]) { duicuo[i]=true; } else {duicuo[i]=false; cuotidaan[j]=zhengquedaan[i]; j++; } } for(i=0;i<tiLiang;i++) { if(duicuo[i]==true) {zhengqueshu++;} else cuowushu++; System.out.print((i+1)+"."); System.out.print(duicuo[i]); } zhengquelv=(zhengqueshu/(zhengqueshu+cuowushu))*100; System.out.print(" 正确率："); System.out.println(zhengquelv+"%"); cuotiji(panduan,duicuo); System.out.print("请选择是否进行错题重做，是输入1，否输入2"); choose1=s.nextInt(); while(choose1==1) { cuotichonglian(panduan,duicuo,(int)cuowushu); for(i=0;i<(int)cuowushu;i++) { System.out.print("第"+(i+1)+"道错题错误次数为"+cuoticishu[i]); System.out.print(" "); } System.out.print("请选择是否继续，是输入1，否输入2："); choose1=s.nextInt(); } System.out.print(" 程序结束"); }}